BIO352_TESTBANK | Snustad Practice Quiz | RATED A+

Snustad Practice Quiz Chapter 07 1) In sweet peas, red flowers (R) are dominant to white (r) and long pollen (L) is dominant to short (l). Suppose you cross a heterozygous plant (RrLl) to a homozyg ous recessive plant (rrll) and record the following results: Red, Long 145 White, Short 138 Red, Short 11 White, Long 14 Which of the following statements is true, based on these results? a) The two loci are linked. b) The two loci assort independently. c) The R gene is epistatic to the L gene. d) Both b and c e) None of the above 2) In sweet peas, red flowers (R) are dominant to white (r) and long pollen (L) is dominant to short (l). Now suppose you repeat the cross between a heterozygous plant (RrLl) and a homozygous recessive plant (rrll) and instead record these results: Red, Long 11 White, Short 14 Red, Short 145 White, Long 138 Which of the following statements is true, based on these results? a) The two loci are linked. b) The genes are arranged in a cis conformation in the heterozygous parent. c) The genes are arranged in a trans conformation in the heterozygous parent. d) Both a and b e) Both a and c 3) In sweet peas, red flowers (R) are dominant to white (r) and long pollen (L) is dominant to short (l). Suppose you cross a heterozygous plant (RrLl) and a homozygous recessive plant (rrll) and record these results: Red, Long 11 White, Short 14 Red, Short 145 White, Long 138 What it the chi-square statistic for these numbers? a) 114.1 b) 586.3 c) 216.5 d) 7.8 e) none of the above 4) In sweet peas, red flowers (R) are dominant to white (r) and long pollen (L) is dominant to short (l). Suppose you cross a heterozygous plant (RrLl) and a homozygous recessive plant (rrll) and record these results: Red, Long 11 White, Short 14 Red, Short 145 White, Long 138 What it the map distance between the two loci? a) 11.1% b) 14.6% c) 91.88% d) 8.12% e) none of the above 5) Crossing over has which of the following outcomes? a) Formation of chiasmata in early prophase b) recombination of genes on the same side of the crossover point c) multiple alleles for a given gene in a single chromatid d) formation of chiasmata in late prophase e) formation of chiasmata in late metaphase 6) Following meiosis, you recover 75 chromosomes with no crossovers, 35 chromosomes with a single crossover, 10 chromosomes with a double crossover, and 3 with a triple crossover. What is the average number of crossovers between these two genes? a) 0.285 b) 0.163 c) 0.521 d) 0.655 e) None of the above 7) You have set up a two-point testcross between a female heterozygote and a male who is homozygous recessive for rb (ruby eyes) and t (tan body). Using the map of the Drosophila X chromosome (Figure 7.1), how many recombinant progeny would you expect to count if you collect 1200 offspring? a) 120 b) 240 c) 300 d) 600 e) 800 8) Morgan set up test crosses between females who were heterozygous for purple eye (pr) and vestigial wings (vg) with a homozygous recessive male. He obtained two sets of data for his two lines of heterozygous females: Heterozygous line #1 Heterozygous line #2 pr+vg+ 1339 pr+vg+ 157 pr vg 1195 pr vg 146 pr+ vg 151 pr+ vg 965 pr vg+ 154 pr vg+ 1067 Based on this data, which of the following statements is true? 1) The two loci are linked. 2) The two loci are unlinked. 3) The genes are arranged in a cis configuration in the heterozygous line #1, and trans configuration in line #2. 4) The genes are arranged in a trans configuration in the heterozygous line #1, and cis configuration in line #2. a) 1 and 3 b) 1 and 4 c) 2 and 3 d) 2 and 4 e) None of the above can be determined from this data. 9) In order to determine the relative order of genes on a chromosome, scientists use: a) a one-point testcross b) a two-point testcross c) a three-point testcross d) all of these e) none of these 10) For a given homozygote, five genes are arranged in cis configuration in this order: A-----B------C------D E a------b------c-------d e How many gamete combinations can be produced by this individual, assuming the genes assort independently? a) 4 b) 8 c) 16 d) 32 e) 64 Answer: d Feedback: There are two potential alleles for each of the five genes, so 25 = 32. Section: 7.2 Chromosome Mapping Difficulty Level: Medium 11) For a given homozygote, five genes are arranged in cis configuration in this order: A-----B------C D E a------b------c-------d e Which of the following gametic combinations would you expect to observe as a result of a single crossover? a) ABcDe b) ABCdE c) ABCde d) AbcDE e) ABcdE 12) For a given homozygote, five genes are arranged in cis configuration in this order: A-----B------C------D E a------b------c-------d e Which of the following gametic combinations would you expect to observe as a result of three crossovers? a) ABcDe b) ABCdE c) ABCde d) AbcDE e) ABcdE 13) For a given homozygote, five genes are arranged in cis configuration in this order: A-----B------C D E a------b------c-------d e Which of the following gametic combinations could not be the result of a three-point crossover? a) ABcDe b) AbCde c) Abcde d) AbcDE e) ABcdE 14) The inhibition of a crossover by another is known as: a) a marker b) coefficient of coincidence c) interference d) translocation e) none of these 15) You are performing a three-point test cross in order to map the order and distance between three genes, designated X, Y, and Z, and you obtain the following results: Phenotypes Number Observed Which gene is in the middle? a) X b) Y c) Z d) There is not enough data to make this determination. 16) You are performing a three-point test cross in order to map the order and distance between three genes, designated X, Y, and Z, and you obtain the following results: Phenotypes Number Observed Which genes exhibit coupling (cis) configuration? a) X and Z b) Y and Z c) X and Y d) X, Y, and Z e) There is not enough data to make this determination. 17) You are performing a three-point test cross in order to map the order and distance between three genes, designated X, Y, and Z, and you obtain the following results: Phenotypes Number Observed Which is the coefficient of coincidence for this data set? a) 0 b) 1 c) 8 d) 0.5 e) There is not enough data to make this determination. 18) The localization of genes in reference to cytological landmarks is known as: a) recombination mapping b) cytogenetic mapping c) localization mapping d) interference mapping e) translocation mapping 19) Human pedigree analysis can provide which of the following pieces of information: 1. linkage between human genes 2. estimates of recombination frequencies 3. inheritance of chromosomal markers a) 1 b) 2 c) 3 d) 1 and 2 e) All of these 20) The process of recombination: a) cannot bring favorable mutations together b) is not under genetic control c) can be suppressed by chromosome rearrangements d) all of these e) none of these Show Less